Standard Mathematics Primary 5 Area of Triangle

The figure below is made up of a rectangle and a triangle joined along one edge. The rectangle has a length of 12 cm and a width of 8 cm. The triangle shares the 12 cm edge of the rectangle as its base and has a perpendicular height of 5 cm. What is the total area of the composite figure?

A 126 cm²
B 156 cm²
C 66 cm²
D 30 cm²
Show Worked Solution

Worked Solution

Step 1: Find the area of the rectangle. Area of rectangle = length × width = 12 × 8 = 96 cm² Step 2: Find the area of the triangle. Area of triangle = ½ × base × height = ½ × 12 × 5 = 30 cm² Step 3: Add both areas to find the total area of the composite figure. Total area = 96 + 30 = 126 cm² Answer: 126 cm²

Correct answer: 126 cm²

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